Mantellian Museum at Lewes. 13 
enormous reptiles have been identified, and there are also 
bones and teeth of other animals, not yet determined. 
The large reptiles at present ascertained are the Crocodile, 
the Plesiosatrus, the Megalosatirus, and the Iguanedon. The 
remains of the crocodile in this museum consist of teeth, verte- 
bree, ribs, &c., belonging to two or more large species of these 
animals; one of which Mr. Mantell co onjectures ras about 
25 ft. in length. Some of the teeth present all the essential 
characters of the teeth of the recent crocodile. ‘The Plesio- 
sairus was first discovered in the lias near Lyme in Dorset- 
shire, and has been well described by Mr. Coneybeare ; ; some 
bones of this animal have been found in Tilgate Forest, and 
are in this collection, but nothing approaching to an entire 
skeleton. ‘The remains of a gigantic animal of the lizard 
genus were discovered at Stonesfield in Oxfordshire, and 
described by Dr. Buckland; to this animal he has given the 
name of the Megalosatirus. "Bones : apparently belonging to the 
same species, particularly the thigh bone, ribs, teeth, and 
vertebrae, were found at Tilgate, and are placed in this col- 
lection, This animal bears the nearest affinity to the monitor, 
there is a stuffed specimen of the latter in the museum. The 
Iguanodon is so named trom its resemblance, in many respects, 
to the living iguana. ‘The discovery of the remains of this 
animal is re searded by Mr. Mantell as the most gratifying 
result of his labours. The teeth were first discovered by 
Mrs. Mantell in the coarse conglomerate stone of Tilgate 
Forest in the year 1822, since which time Mr. Mantell has 
collected a most interesting series of them, displaying every 
gradation of form, from ‘the perfect tooth in the young 
animal, to the last stage, that of a mere bony stump worn 
away by mastication. ‘These teeth are comparatively rare, 
and the only locality in which they have hitherto been no- 
ticed is in the immediate vicinity of Tilgate Forest. Their 
external form is so remarkable, and hears so striking a re- 
semblance to the grinders of the herbivorous Rice: that 
Mr. Mantell was, at first, doubtful respecting the order of 
animals to which they belonged, but subsequent discoveries 
proved that they were the teeth of a nondescript herbivorous 
reptile. Baron ‘Cuvier, to whom they were shown, regards 
them as belonging to an animal hitherto entirely unknown, 
but they bear “the greatest resemblance to the teeth of the 
iguana, particularly in having the edges serrated. The iguana 
is an herbivorous, but not a masticating 1g, reptile. The figures 
of the teeth which are here given (fg. 1.) are of the natural size; 
but it should be recollected that the teeth of crocediles and 
other lacertian animals are very numerous and small, com- 
